1911.] NATURAL SCIENCES OF PHILADELPHIA. 299 



is as long as the setigerous tubercle and projects straight out beyond 

 it. No noteworthy changes in form of the parapodia occur throughout 

 its entire length. 



True seta\are all of one form (PI. XX. figs. 151, 152), simple, bilim- 

 bate, sigmoid, tapered to an acute point and with a finely serrate 

 margin and distinctly striated stem. Those in the dorsal part of the 

 fascicle are usually longer. Beginning at XIII, IX or X in the several 

 specimens, they are accompanied by a single yellow, stout, blunt, 

 rodlike aciculum (fig. 151) which projects obliquely far beyond the 

 surface from the ventral border of the setae bundle. Farther back it 

 becomes even stouter and reaches nearly or quite to the tip of the 

 postsetal'lobe. 



The most distinctive characters of the species are found in the jaws 

 (PI. XX, figs. 153, 154). Mandibles rather large for the genus, black, 

 shaped like a pair of broad snow-shoes with the tapering heels behind 

 and united anterior to the middle by a broad chitinous band (fig. 153). 

 Maxillae black; forceps jaws (I) very strongly falcate and hamate 

 with acute^tips, stout at the base with massive, quadrate masticatory 

 plates, the inner margin of which bears only three or four distinct 

 small teeth and some obscure crenulations. Hinge-pieces of carriers 

 (fig. 154) very small and strongly divergent from an irregular hori- 

 zontal plate with attached fringed chitinous tendons at the united 

 anterior ends of the long, slender, attenuated filaments, which barely 

 exceed twice the length of the series of jaws. Large tooth plates, 

 narrow and nearly straight or oblong, with a supporting flange or 

 plate running nearly their entire length and meeting at nearly a right 

 angle in a ridge bearing a series of six or seven teeth, the first of which 

 is enlarged and talonlike, the remainder equal, regular, acute and 

 recurved. Anterior to this plate on each side is a group of three 

 small crowded tooth plates, each bearing a single, long, slender, strongly 

 curved and very acute tooth on a V-shaped base. These represent 

 III, IV and V (fig. 154). 



Stations 4,451, Monterey Bay, off Point Pinos Lighthouse, 47-51 

 fathoms, green mud and sand; 4,460 (type station) same locality, 

 55-167 fathoms, green mud and gravel. 



GLYCBRID^J. 



Glycera oapitata Oersted. 



Glycera capitata Oersted, Gronl. Ann. Dorsibr., 1843, p. 44, Tab. VII. 



What is undoubtedly a variety of this species, differing in only a 

 slight and variable degree from typical examples from the Atlantic 

 Ocean, is not uncommon throughout this region. The principal 



